Risk of congenital anomalies after exposure to asthma medication in the first trimester of pregnancy – a cohort linkage study

Objective To examine the effect of maternal exposure to asthma medications on the risk of congenital anomalies. Design Meta‐analysis of aggregated data from three cohort studies. Setting Linkage between healthcare databases and EUROCAT congenital anomaly registries. Population 519 242 pregnancies in Norway (2004–2010), Wales (2000–2010) and Funen, Denmark (2000–2010). Methods Exposure defined as having at least one prescription for asthma...